PO type to distinct (centralize purchase, VMI purchase, Import, Local, etc.)

What if I need to distinct different PO type (e.g. Centralize purchase, Import Purchase, Local Purchase, etc.) and they are NOT in:

• Purchase Agreement - Blanket and Contract
• Purchase Order - Planned, Standard, Requester Change Order
• Quotation - Bid, Catalog, and Standard
• Release - Blanket and Scheduled
• Request for Quotation - Bid, Catalog, and Standard
• Requisition - Internal and Purchase

I read the following links but they all state the constrain / limitation of system but not a solution...

https://community.oracle.com/message/12403361#12403361

Note 304022.1 - POXSTDDT Cannot Add New Subtype for Purchase Order or Requisition Document Types

Note 404436.1 - POXSTDDT: Is It Possible To Create New Purchasing Document Types